<html>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width,initial-scale=1.0" />
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
<body>
    <div id="app">
    <input v-model="message" type="text"/>
    <p>value is:{{ message }}</p>
</div>
    <script>
        new Vue({
            el:"#app",
            data:{
                message:""
            }
        })
    </script>
</body>
</html>